Furnace



H. R.'G'RIFFITHS.

FURNACE. APPLICATION FILED AIIG.5, 1920.

2I I92 2 SHEETS-SHEET lfatenterltlct.. 241, 19122.

HERBERT It. GRIFFITHS, OIF HOMESTEAD, PENNSYLVANIA.

FRNACE.

application filed August 5, 1920. serial No. 401,325.

To all w hom t may concern:

Be it known that l, HERBERT l; Guir- `i iriis, a citizen of the UnitedStates, resid-` ing at Homestead, in the county of Allegheny and Stateof Pennsylvania, have invented certain new and 'useful l1nprovements inFurnaces, of which the following is a specification- This inventionrelates to furnaces,` de signed primarily for the production of steel,but it is to be understood that the furnace canbe employed for anypurposes wherein -it is found applicable, and has for its object toprovide a furnace, in a manner as herein after set forth, with a pair ofdown-take structures, one at each end thereof, and each constructed witha collection chamber having the walls thereof smooth anduninterruptedthroughout and further squared off at the lower ends or atthe bottom of the chamber, whereby any retardation of the cinder "andslag during the down travel thereof through said chamber is prevented,and further to prevent any accumulation of the cinder and slag withinthe collection chamber, and each of said structures having associatedtherewith a removable hopper providing` a removable bottom for thecollection chamber and employed as a `pocket for the collection ofcinder and slag during the process of combustion, the hopper being sosetup that when occasion requires it can be removed and dumped, undersuch conditions setting upa convenient method for removing the collectedcinder and slag.

Further objects of the invention are to provide a furnace for thepurpose set forth, in a manner as hereinafter referred to, which issimple in its construction and arrangement, strong, durable, efficientand convenient in its use, readily set up, and comparatively inexpensiveto build.

With the foregoing and other objects in view, the invention consists ofthe novel construction, combination and arrangement of parts ashereinafter set forth and illustrated in the accompanying drawings,wherein is shown an embodiment of the invention, but it is to beunderstood that changes, variations and modifications, can be resortedto which come within the scope of the claim hereunto appended.

ln the drawings wherein like reference Figure 2.

`ence characters denote corresponding parts throughout the severalviewsz Figure 1 is a front elevation of a furnace in accordance withthis invention.

Figure 2 is a longitudinal sectional view thereof.

Figurel Sis a section on 1ine`IlI111 Figure 4L is a section on line11I-1V Figure 3.

A furnace in accordance with this invention includes a central structureand a pair `of end structures, the former comprises a base foundation 1,depressed to provide a-` hearth 2, whichy has a lining 3, of refractorymaterial, and the said central structure further includes a roof 4c, afront wall 5 and a rear wall 6. The front wall 5 has entrance openingsor doors 7, so that the material or ore to be acted on, can be suppliedto the hearth 2. The rear wall 6 is formed with,` a discharge port orpassage 8. structure forms a heating chamber 9, having each end open, asat 10.

Each of the end structures is what may be termed a down-take and as eachis similarin construction, but one will be described, as

The central the description of one will apply to the other.

The down-takes communicate by fines 25 with the checkerwork A.

Each down-take comprises a roof 11, an end wall 12, a rear wall 13, afront wall 14, an intermediate partition 15, and an inner end wall 16which is of less height than the end wall 12.

Each down-take further comprises an nlet chamber `17 and collectionchamber 18. The chamber 17 is formedby the upper portion of the outerend wall 12, the roof 11, front and rear walls 13, 14, and the partition15, the latter forms the bottom of the inlet chamber 17. The open end 10of the chamn ber 9 opens into the chamber 17.

The collection chamber 18, is formed by the partition 15, front and rearwalls 13, 14 and end walls 12, 16. The wall 16 has the rear portion Bthereof tapered towards the checke1work A. One wall of a flue 25 forms acontinuation of the taper of the tapering portion B of the wall 16. Thetaperw ing of the wall 16 and the wall of the fiue 25 allows for greaterdraft to the checkerm work it.. n

rl`hc partition l5 `terms' the roo t o'l" the chaniber 18, and isprovided with an opening 19 whereby communication is established betweenthe chambers 17 and 18.y

The bottom of the chamber 18. is formed by what may be termed aremovable collecting hopper' 20, which is provided with a lining ofrefractory material 21. The hopper 20, which constitutes a pocket, isdetachably supported on a shii'table truck 22, which is mounted totravel on a track formed by the rails 23, extended to a position withinthe down-take below the chamber 18. The rear wall. 1il. is cutaway, asat 24C, to provide an opening to allow for the; shitting` of the truckinto andi out ot' the down-take.

Extending into each chamber 17, in prox4 imity to the open end 10, ofthe chamber 9,

is a pair of oppositely disposed; burners lor gas. The burners for onechamber 17 are indicated at 26 andv for the other chamber at 27. Whenthe burners 2G are used the open end 10 in proximity thereto forms aninlet andthe other open end 1() of the chamber 9 formsan outlet, and thesame arrangement relative to the open ends 10, is had when the otherlburners are used.v But one pair of burners is employed at one time.

Associated with each of the trucks 22, is a hydraulic or lcompressed aircylinder 28, havingy a piston, not shown, and thelatter is formed withla piston rod 29, which is connectedv with the truck 22, for the purposeof shifting the truck into and out o1' the downtake when desired.. Vhenshifted outwardly the hopper 2O can be removed from the truck, by anysuitable elevating` mechanism, and then dumped. Eyes 30 are provided onthe hopper so the elevating` mechanism can be detachablyconnectedtherewith. To provide for the sealing of the bottom of each of thechambers 18, the walls. 12, 14 and 16 are squared off or under cut attheir lower ends to provide shoulders 31, against which the top edgesyof the sides and inner end wall olfA the hopper abuis. The wall 13% isalso squared oli and cut away to l'oriu a bevelled shoulder 32, whichextends above the shoulders 31, and against the shoulder 32 abuts theextended upper end of the 'front end wall of the hopper 20. The frontend wall of the hopper is o1 greater height than the side walls and'inner end wall. See Eigure 3.

The walls of the chambers 18 are smooth throughout, sothat the fall oithe cinder and slag will not be interfered with and no accureadilyreplaced by a new one without discarding the truck. The hopper is soconstructed as to form a complete closure for the bottom of the chamber18.

What I claim is In combination a furnace havingy a hearth and a downwardpassage comlminicatinfbr with the hearth, said downward passage being`rectangular in plan and having three of its walls undercut and the other.wall bevelled, the bevel extending above the undercuts and saidundercut walls providingT tor the passage ofv a removable hopper belowthe passage, said passage adapted to communicate with the checker workot the furnace and having one of itswalls tapered inwardly towards thechecker work providing the passage of greater width at the checker workwhereby the size of the latter is increased.

In testimony whereof I atlix my signature.

HERBERT It. GRIFFITIIS.

